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acinetobacter baumannii

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https://www.readbyqxmd.com/read/28642945/nonribosomal-peptide-synthetase-biosynthetic-clusters-of-eskape-pathogens
#1
REVIEW
Andrew M Gulick
Covering: up to 2017.Natural products are important secondary metabolites produced by bacterial and fungal species that play important roles in cellular growth and signaling, nutrient acquisition, intra- and interspecies communication, and virulence. A subset of natural products is produced by nonribosomal peptide synthetases (NRPSs), a family of large, modular enzymes that function in an assembly line fashion. Because of the pharmaceutical activity of many NRPS products, much effort has gone into the exploration of their biosynthetic pathways and the diverse products they make...
June 23, 2017: Natural Product Reports
https://www.readbyqxmd.com/read/28642142/epidemiology-and-outcomes-of-bloodstream-infections-in-177-severe-burn-patients-from-an-industrial-disaster-a-multicenter-retrospective-study
#2
Chenqi Tang, Junqiang Li, Beiming Shou, Bohan Pan, Tiansheng Chen, Yongqiang Xiao, Xiaopeng Zheng, Shichu Xiao, Qian Tan, Zhaofan Xia
OBJECTIVES: To determine the characteristics of bloodstream infections (BSIs) and to evaluate the impact of BSIs on mortality in severe burn patients. METHODS: A retrospective observational study was conducted in 20 tertiary hospitals. A total of 185 Patients who experienced a massive dust explosion in eastern China were included. RESULTS: After exclusion, 177 patients were analyzed. The median total body surface area (TBSA) burned was 95% (interquartile range [IQR], 85%-98%)...
June 19, 2017: Clinical Microbiology and Infection
https://www.readbyqxmd.com/read/28642139/clinical-characteristics-and-epidemiology-of-sepsis-in-the-neonatal-intensive-care-unit-in-the-era-of-multi-drug-resistant-organisms-a-retrospective-review
#3
Dawood Yusef, Tala Shalakhti, Samah Awad, Hana'a Algharaibeh, Wasim Khasawneh
BACKGROUND: Sepsis in the neonatal intensive care unit (NICU) remains one of the most significant causes of morbidity and mortality, especially for preterm newborns. Multi-drug resistant organisms (MDROs) are emerging as important pathogens that cause neonatal sepsis in NICU. Therefore, studying the epidemiology, clinical features, and outcome caused by MDROs vs. non-MDROs, and identifying risk factors that may predispose patients to sepsis by MDROs are important. METHODS: Episodes of blood culture-proven sepsis (age: 0-90 days) in the NICU at our institution from January 2012 to December 2015 were retrospectively reviewed...
June 9, 2017: Pediatrics and Neonatology
https://www.readbyqxmd.com/read/28639245/biofilm-forming-ability-and-clonality-in-acinetobacter-baumannii-strains-isolated-from-urine-samples-and-urinary-catheters-in-different-european-hospitals
#4
Claudia Vuotto, Filipa Grosso, Francesca Longo, Maria Pia Balice, Mariana Carvalho de Barros, Luisa Peixe, Gianfranco Donelli
OBJECTIVE: Biofilm formation has been associated with the persistence of Acinetobacter baumannii in hospital settings and its propensity to cause infection. We investigated the adhesion ability and clonality of 128 A. baumannii isolates recovered from urine and urinary catheters of patients admitted to 5 European hospitals during 1991-2013. METHODS: Isolates identification was confirmed by rpoB sequencing and by the presence of blaOXA-51. The presence of carbapenemases was detected by PCR...
June 22, 2017: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/28639145/in-vitro-and-in-vivo-activity-of-theaflavin-epicatechin-combinations-versus-multidrug-resistant-acinetobacter-baumannii
#5
Jonathan W Betts, Michael Hornsey, David W Wareham, Roberto M La Ragione
INTRODUCTION: Acinetobacter baumannii is an important human nosocomial pathogen; most clinical isolates are multidrug-resistant (MDR). Infections caused by A. baumannii often lead to high morbidity and mortality, with limited treatment options. Owing to the small number of anti-Gram-negative antibiotics in the development pipeline, researchers are looking to other natural compounds. The aim of this study was to determine the in vitro kill kinetics, in vivo efficacy and toxicity of theaflavin-epicatechin combinations against MDR A...
June 21, 2017: Infectious Diseases and Therapy
https://www.readbyqxmd.com/read/28638371/the-anticancer-peptide-tat-rasgap317-326-exerts-broad-antimicrobial-activity
#6
Mathieu Heulot, Nicolas Jacquier, Sébastien Aeby, Didier Le Roy, Thierry Roger, Evgeniya Trofimenko, David Barras, Gilbert Greub, Christian Widmann
Antibiotic resistance has become a major health issue. Nosocomial infections and the prevalence of resistant pathogenic bacterial strains are rising steadily. Therefore, there is an urgent need to develop new classes of antibiotics effective on multi-resistant nosocomial pathogenic bacteria. We have previously shown that a cell-permeable peptide derived from the p120 Ras GTPase-activating protein (RasGAP), called TAT-RasGAP317-326, induces cancer cell death, inhibits metastatic progression, and sensitizes tumor cells to various anti-cancer treatments in vitro and in vivo...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28638248/evaluation-of-microorganisms-causing-ventilator-associated-pneumonia-in-a-pediatric-intensive-care-unit
#7
Ayse Betul Ergul, Serife Cetin, Yasemin Ay Altintop, Sefika Elmas Bozdemir, Alper Ozcan, Umit Altug, Hasan Samsa, Yasemin Altuner Torun
OBJECTIVE: The aim of this study was to identify microorganisms causing ventilator-associated pneumonia (VAP) and also study the antibiotic resistance/susceptibility. MATERIALS AND METHODS: We retrospectively assessed microorganisms isolated from patients diagnosed with VAP in a pediatric intensive care unit between January 1, 2014, and June 30, 2016. RESULTS: We included 44 patients diagnosed with VAP. The prevalence thereof was 8.6 patients per 1,000 ventilator days...
June 2017: Eurasian Journal of Medicine
https://www.readbyqxmd.com/read/28636788/role-of-positively-charged-residues-on-the-polar-and-non-polar-faces-of-amphipathic-%C3%AE-helical-antimicrobial-peptides-amps-on-specificity-and-selectivity-for-gram-negative-pathogens
#8
Ziqing Jiang, Colin T Mant, Michael Vasil, Robert S Hodges
We have designed de novo and synthesized eight 26-residue all D-conformation amphipathic α-helical cationic antimicrobial peptides (AMPs), four with "specificity determinants" which provide specificity for prokaryotic cells over eukaryotic cells and four AMPs without specificity determinants. The eight AMPs contain six positively charged Lys residues on the polar face in four different arrangements to understand the role of these residues have on antimicrobial activity against 14 Acinetobacter baumannii strains, 7 of which were resistant to polymyxin B and colistin; 6 diverse Pseudomonas aeruginosa strains and 17 Staphylococcus aureus strains, 9 of which were Methicillin-sensitive (MSSA) and 8 of which were Methicillin-resistant (MRSA)...
June 21, 2017: Chemical Biology & Drug Design
https://www.readbyqxmd.com/read/28630181/in-vitro-activity-of-the-siderophore-cephalosporin-cefiderocol-against-a-recent-collection-of-clinically-relevant-gram-negative-bacilli-from-north-america-and-europe-including-carbapenem-non-susceptible-isolates-the-sidero-wt-2014-study
#9
Meredith A Hackel, Masakatsu Tsuji, Yoshinori Yamano, Roger Echols, James A Karlowsky, Daniel F Sahm
Cefiderocol (formerly S-649266) is an investigational siderophore cephalosporin. Iron-depleted cation-adjusted Mueller-Hinton broth (ID-CAMHB) was prepared according to the Clinical and Laboratory Standards Institute (CLSI) protocol and used to perform broth microdilution testing of cefiderocol against a 2014-2015 collection of clinical isolates of gram-negative bacilli from North America (n=4,239) and Europe (n=4,966). The concentration of cefiderocol inhibiting 90% of isolates tested (MIC90) was: 0.5 (North America; n=3,007) and 1 μg/ml (Europe; n=3,080) for all isolates of Enterobacteriaceae; 1 (North America; n=30) and 4 μg/ml (Europe; n=139) for meropenem-non-susceptible (MIC ≥2 μg/ml) isolates of Enterobacteriaceae; 0...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28630178/efficacy-of-cefiderocol-against-carbapenem-resistant-gram-negative-bacilli-in-immunocompetent-rat-respiratory-tract-infection-models-recreating-human-plasma-pharmacokinetics
#10
Shuhei Matsumoto, Christine M Singley, Jennifer Hoover, Rio Nakamura, Roger Echols, Stephen Rittenhouse, Masakatsu Tsuji, Yoshinori Yamano
Cefiderocol (S-649266), a novel siderophore cephalosporin, shows potent activity against carbapenem-resistant Gram-negative bacilli. In this study, we evaluated the efficacy of cefiderocol against carbapenem-resistant Gram-negative bacilli (Pseudomonas aeruginosa,Acinetobacter baumannii and Klebsiella pneumoniae) in immunocompetent rat respiratory tract infection models recreating plasma pharmacokinetics (PK) profiles in healthy human subjects. A total of 6 clinical isolates (1 cephalosporin-susceptible P. aeruginosa, 1 multidrug-resistant P...
June 19, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28629972/characterization-of-dioxygenases-and-biosurfactants-produced-by-crude-oil-degrading-soil-bacteria
#11
Santhakumar Muthukamalam, Sivalingam Sivagangavathi, Dharmapal Dhrishya, Sadras Sudha Rani
Role of microbes in bioremediation of oil spills has become inevitable owing to their eco friendly nature. This study focused on the isolation and characterization of bacterial strains with superior oil degrading potential from crude-oil contaminated soil. Three such bacterial strains were selected and subsequently identified by 16S rRNA gene sequence analysis as Corynebacterium aurimucosum, Acinetobacter baumannii and Microbacterium hydrocarbonoxydans respectively. The specific activity of catechol 1,2 dioxygenase (C12O) and catechol 2,3 dioxygenase (C23O) was determined in these three strains wherein the activity of C12O was more than that of C23O...
June 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28626312/bacterial-contamination-in-physical-therapy-departments-in-the-state-of-kuwait
#12
Sameera H Aljadi, Mashael Al-Shemmari, Jumana Al-Ramzi, Shoug Al-Abdullatif, Zahraa Hajeyah, Laila Jamal, Sara Al-Bahar
[Purpose] Interferential therapy and electrical stimulation are electrophysical modalities commonly used in physical therapy departments to treat patients with musculoskeletal problems. These machines are applied directly to the patient's skin via a medium or electrodes, which can facilitate the transmission of microorganisms from one patient to another. The purpose of this study was to determine the extent of microorganism contamination in the machines sponges at physical therapy departments in Kuwait hospitals...
June 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28625698/a-cold-hard-menace-a-contaminated-ice-machine-as-a-potential-source-for-transmission-of-carbapenem-resistant-acinetobacter-baumannii
#13
Anubhav Kanwar, T Nicholas Domitrovic, Sreelatha Koganti, Peter Fuldauer, Jennifer L Cadnum, Robert A Bonomo, Curtis J Donskey
During an investigation of potential sources of transmission of multidrug-resistant gram-negative bacilli on a spinal cord injury unit, we recovered genetically related carbapenem-resistant Acinetobacter baumannii isolates from the stool of 3 patients, the hands of a nurse, and an ice machine water outlet spout and drain. Our findings suggest that contaminated ice machines could serve as a potential reservoir for dissemination of multidrug-resistant gram-negative bacilli.
June 15, 2017: American Journal of Infection Control
https://www.readbyqxmd.com/read/28624549/evaluation-of-a-new-trilocus-sequence-based-multiplex-pcr-to-detect-major-acinetobacter-baumannii-clonal-complexes-circulating-in-brazil
#14
Francielli Mahnic de Vasconcellos, Monique Ribeiro Tiba Casas, Laís Calissi Brisolla Tavares, William Vaz de Sousa, Doroti de Oliveira Garcia, Carlos Henrique Camargo
Dissemination of carbapenem-resistant Acinetobacter baumannii (CRAB) is mainly due to the spread of clonal lineages, particularly those included into the clonal complexes (CC) CC1, CC2, CC15, CC25, and CC79. We evaluated the usefulness of a recently modified PCR-based trilocus sequence-based typing (m3LST) in comparison with the standard multilocus sequence typing (MSLT) of 7 housekeeping genes as per the Institute Pasteur Scheme to assign the clonal complexes in CRAB. A collection of 78 CRAB isolated from 67 different Brazilian health institutions was submitted to both methodologies, and concordance rate was calculated...
June 14, 2017: Infection, Genetics and Evolution
https://www.readbyqxmd.com/read/28623298/constraint-based-modeling-identifies-new-putative-targets-to-fight-colistin-resistant-a-baumannii-infections
#15
Luana Presta, Emanuele Bosi, Leila Mansouri, Lenie Dijkshoorn, Renato Fani, Marco Fondi
Acinetobacter baumannii is a clinical threat to human health, causing major infection outbreaks worldwide. As new drugs against Gram-negative bacteria do not seem to be forthcoming, and due to the microbial capability of acquiring multi-resistance, there is an urgent need for novel therapeutic targets. Here we have derived a list of new potential targets by means of metabolic reconstruction and modelling of A. baumannii ATCC 19606. By integrating constraint-based modelling with gene expression data, we simulated microbial growth in normal and stressful conditions (i...
June 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28622734/epidemiology-of-multidrug-resistant-acinetobacter-baumannii-strains-in-iran-a-systematic-review-and-meta-analysis
#16
Abed Zahedi Bialvaei, Ebrahim Kouhsari, Amin Salehi-Abargouei, Nour Amirmozafari, Rashid Ramazanzadeh, Ali Ghadimi-Daresajini, Mansour Sedighi
Acinetobacter baumannii is an important opportunistic pathogen that causes major public health concern especially in hospitalized patients due to the acquisition of multidrug resistance (MDR). The aim of this study was to systematically review published data about the prevalence rate of MDR-A. baumannii (MDR-AB) from different parts of Iran and provide an overall relative frequency (RF) using meta-analysis. All available national and international databanks were searched to find published studies up to June 2016...
June 16, 2017: Journal of Chemotherapy
https://www.readbyqxmd.com/read/28621711/indigenous-probiotic-lactobacillus-isolates-presenting-antibiotic-like-activity-against-human-pathogenic-bacteria
#17
Debashis Halder, Manisha Mandal, Shiv Sekhar Chatterjee, Nishith Kumar Pal, Shyamapada Mandal
BACKGROUND: Indigenous lactic acid bacteria are well known probiotics having antibacterial activity against potentially pathogenic bacteria. This study aims to characterize the curd lactobacilli for their probiotic potentiality and antagonistic activity against clinical bacteria. METHODS: Four curd samples were processed microbiologically for the isolation of lactic acid bacteria (LAB). The LAB strains obtained were identified by conventional methods: cultural aspect, gram-staining, biochemical and sugar fermentation tests...
June 16, 2017: Biomedicines
https://www.readbyqxmd.com/read/28619105/patterns-of-antimicrobial-resistance-in-intensive-care-unit-patients-a-study-in-vietnam
#18
Giang M Tran, Thao P Ho-Le, Duc T Ha, Chau H Tran-Nguyen, Tuyet S M Nguyen, Thao T N Pham, Tuyet A Nguyen, Dung A Nguyen, Hoa Q Hoang, Ngoc V Tran, Tuan V Nguyen
BACKGROUND: Antimicrobial resistance has emerged as a major concern in developing countries. The present study sought to define the pattern of antimicrobial resistance in ICU patients with ventilator-associated pneumonia. METHODS: Between November 2014 and September 2015, we enrolled 220 patients (average age ~ 71 yr) who were admitted to ICU in a major tertiary hospital in Ho Chi Minh City, Vietnam. Data concerning demographic characteristics and clinical history were collected from each patient...
June 15, 2017: BMC Infectious Diseases
https://www.readbyqxmd.com/read/28618727/analysis-of-epidemiology-and-risk-factors-for-mortality-in-ventilator-associated-pneumonia-attacks-in-intensive-care-unit-patients
#19
Ayşe But, Meltem Arzu Yetkin, Dilek Kanyilmaz, Halide Aslaner, Aliye Baştuğ, Adalet Aypak, Pınar Öngürü, Esragül Akinci, Nevzat Mehmet Mutlu, Hürrem Bodur
BACKGROUND/AIM: The aim of this study was to investigate the epidemiologic characteristics, the causative microorganisms and their antimicrobial susceptibility patterns, and the prognostic risk factors for mortality in critically ill patients with ventilator-associated pneumonia (VAP). MATERIALS AND METHODS: In this retrospective observational study, all the critically ill patients with VAP hospitalized in a medical/surgical intensive care unit (ICU) between January 2010 and June 2015 were evaluated...
June 12, 2017: Turkish Journal of Medical Sciences
https://www.readbyqxmd.com/read/28616070/persistence-of-antibiotic-resistance-plasmids-in-bacterial-biofilms
#20
Benjamin J Ridenhour, Genevieve A Metzger, Michael France, Karol Gliniewicz, Jack Millstein, Larry J Forney, Eva M Top
The emergence and spread of antibiotic resistance is a crisis in health care today. Antibiotic resistance is often horizontally transferred to susceptible bacteria by means of multidrug resistance plasmids that may or may not persist in the absence of antibiotics. Because bacterial pathogens often grow as biofilms, there is a need to better understand the evolution of plasmid persistence in these environments. Here we compared the evolution of plasmid persistence in the pathogen Acinetobacter baumannii when grown under antibiotic selection in biofilms versus well-mixed liquid cultures...
July 2017: Evolutionary Applications
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